The Shabbat before Tisha B'Av is called Shabbat Chazon because of the Haftara which is read:
In it, he prophesies about the destruction of Jerusalem and the Beit Hamikdash. In the times of the Geonim, this Shabbat was called Shabbat Eicha after Megillat Eicha which was also read on this Shabbat.